Calibrating a Humidity Sensor with Saturated Salt Solution — ASTM E104 Method
Calibrating a Humidity Sensor with Saturated Salt Solution — ASTM E104 Method Why Calibrate? The music room contains a pair of B&W Matrix 800 loudspeakers — the original flagship model from 1987. At 110kg each, with crossovers, drive units, and cabinet materials that are no longer manufactured, they are effectively irreplaceable. Keeping them in good condition over decades requires stable humidity. Too dry and surrounds crack, spiders stiffen, and wooden cabinet joints open. Too damp and cones absorb moisture, crossover components corrode, ferrofluid in the tweeters degrades. And most importantly with this pair, the nickel plated magnet assemblies oxidise, binding the voice coils in the coil gap. This has already killed one of the very rare drivers. ...